AI coding agents love to run tests in parallel processes.
That’s great until multiple processes try to use the same local test database at once. A small file lock can serialize access and stop those runs from stepping on each other.
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Running GitHub Actions on a Mac Mini
Matthieu Napoli explains how he replaced GitHub-hosted CI with self-hosted runners on a Mac Mini at home. The setup is simple, fast, and a good look at the trade-offs around isolation, caching, and parallelism. Read Read more…